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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3962275c9eaa2145a13547cdb6e277903d0c6334f141a71d14958910df19f75b' 
  AND token = 'RStothKLOscO6WU9tImC0ToYAbjxuKRlBOhd/MB+fAc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}